Popovers

  <button class="btn btn-outline-primary"
          popover="Popover content"
          [popoverTitle]="'Popover title'"
          [popoverPlacement]="'right'">popover</button>
  <button class="btn btn-outline-primary"
          popover="Popover content"
          [flavor]="'success'"
          [popoverTitle]="'Popover success'"
          [popoverPlacement]="'top'">popover</button>
  <button class="btn btn-outline-primary"
          popover="Popover content"
          [flavor]="'default'"
          [popoverTitle]="'Popover default'"
          [popoverPlacement]="'bottom'">popover</button>
  <button class="btn btn-outline-primary"
          popover="Popover content"
          flavor="danger"
          [popoverTitle]="'Popover danger hover'"
          [popoverOnHover]="true"
          [popoverPlacement]="'left'">popover</button>
      

none